Natural gas carburetor



Nov. 3, 1931. E, RECTOR 1,830,336

NATURAL GAS CARBURETOR Filed oct. 27, 1928 Ma'm/i@ @y Patented Nov. 3, 1931 UNITED. s'rprresv PATENT OFFICE I ENOCB.' RECTOR, 0F NEW YORK, N. Y., ASSIGNOR TO WAUKESHA MOTOR COMPANY, 0F `WAUIKESBIA, WISCONSIN, A CORPORATION F WISCONSIN engine speeds.

NATURAL GAs CARBURETOR Application filed October 27, 1928. Serial No. 315,470.

This inventionrelates to carburetors, and more particularly to a carburetor adapted for use with either natural or artificial gas.

One of the main objects of my invention is to provide a carburetor of simple construction kand operation in which the gas and the air are eifectively commingled and the gas is metered in such manner as toassure proper proportioning of the gas to the air for all Further objects and advantages of my inyention will appear from the detailed description.

In the drawings: Fig. 1 is a central vertical sectional view through' a gas carburetor in accordance with my invention, parts being shown in elevation, also illustrating the method of using a liquid fuel carburetor in combination with my gas carburetor, when desired;

'20 Fig. 2 is a horizontal sectional view taken substantially on line 2 2 of Fig. l.

The carburetor includes a main body or casing 1 which is illustrated as being formed in one piece, though 'this body may be formed A in several sections if desired. The body l known type and includes a cylinder 8 which f includes a stack 2, the lower portion of which is shaped to provide a Venturi element 3. A mixing chamber 4 is provided beneath stack 2 and has communication therewith through a fuel mixture outlet opening 5 at the top of the chamber, this opening constituting the lower end of the Venturi element 3. A gas chamber 6 is provided below thef mixing chamber 4 and a dash pot 7 is provided below the gas chamber.` This dash pot is of is suitably secured to the lower end of body 1, and a plunger 9 which fits loosely within in the bottom wall 15 of the mixing chamber. Gas is admitted to the annular space 16 about the lower portion of tube 13 by means of a gas supply pipe 17, and this gas enters tube 13 through openings 18 in the lower portion thereof.

The gas inlet tube 13 is provided, in its upper portion, with a plurality of radially disposed slots 19 extending lengthwise of the A sleeve 20 fits snugly above the upper portion of the tube for turning movement thereon, this sleeve being provided with slots 21 corresponding to the slots 19 of the tube. The sleeve is of a length to extend above and below the slots of the tube and is provided with a radially projecting arm 22 which extends through a slotted sup-` porting and guide element 23 formed integrally with the wall of mixing chamber 4. Set screws 24 are threaded in the end walls of the element 23 and contact arm 22 lat opposite sides thereof, these screws being held in adjustment by jam nuts 25. By turning the sleeve 2O upon the upper portion of tube 13 direct communication between the mixing chamber and the tube, through the slots 19, is established, and the effective vlsize of these slots can Vbe adjusted /to suit conditions. After being adjusted the sleeve is secured in adjustment by the set screws 24 and associated parts.

As will be noted moreclearly from Fig. 2, the mixing space 4a of chamber 4-is of substantially annular shape and is concentric with the gas inlet tube. This chamber is provided with a radially disposed nipple 26 adapted for reception of the end portion of an air inlet pipe or tube, this nipple having an inner circumferentiall flange defining an air inlet opening 27. A baille 28 is suitably' secured' on sleeve 20 in spaced relation thereto, this baffle being dis osed in front of the inlet openin 27 so t at the entering air stream will e deiected and the air caused to circulate about the annular mixing s ace 4a without disturbing the proper flow o gas throuffh the gas inlet or admission openin of th' tube 13. gs

Flow of the mixture of gas and air through the outlet opening 5 is controlled by an upwardly opening suctionresponsive valve 29 which, in its lowermostposition, closes opening 5. vThis valve is provided'with a depending stem 30 which extends downwardly through the tube 13 and plug 10 l'nto cylinder 8 ofthe dash pot. Valve stem 30 is reduced and threaded at its lower end to provide a. Screw stud 31 and a shoulder 32 at the upper end of this stud. The stud 31 l lowermost position, the metering valve 34 is disposed adjacent the lower ends of slots 19 so as to substantially cut od communication between the gas inlet tube 13 and the mixin chamber. This valve 34 also serves, in conjunction with the tube 13,' to guide the valve stem '30 during vertical reciprocation thereof. The valve stem is a sliding lit through plug 1() which coacts with the valve 34 and assoclated parts to prevent any undesirable looseness or play of valve stem 30.`

A throttle valve 35 is mounted in stack 2 above the Venturi element 3. This valve functions and is operated in a known manner. A gasoline carburetor 36 of known type has communication with stack 2, through a suitable connection 37 and a priming fuel inlet openin 38 disposed above the throttle valve 35. ommunication between the carburetor 36 and stack 2 may be controlled in any suitable manner, as by means of a throttle valve (not shown) in the connection 37.

The function of the gasoline carburetor 36 is to start the engine to which the gas carburetor is connected, in a known manner, by means of a suitable flange 39 at the upper end of stack 2, this flange being secured to the intake manifold of the engine. After the engine has been started, with the throttle valve 35 closed as illustrated in Fig. 1, the carburetor 36 is then cut oli' from the stack 2 and the throttle valve 35 is opened so as to connect the gas carburetor to the engine. A set screw 40 is threaded through a collar l 41 at the bottom of cylinder 8 of the dash pot and is secured in adjustment by a jam nut 42. This set screw contacts'the lower end of valve stem 30 and limits downward movement of valve '29 and the gas metering valve 34. The adjustment of this set screw determines the amount of gas which flows through the slots 19 into the mixing chamber 4 when the throttle valve 35 is first opened.

By adjusting the set screw 40 and the sleevel 20 the proper proportion of gas to the volume of air entering the mixing chamber 4 can be obtained. In this manner, the fuel l eifective area of the slots 19 being increased and decreased in accordance with opening and closing of valve 29. This assures proper proportioning of the gas and air of the fuel mixture for all engine speeds with resulting high efficiency in operation,

What I claim is:

'1. In a gas carburetor a stack, a substantially annular and fixed mixing chamber opening into the stack and having a radial air inlet opening, a fixed gas inlet tube extending into the chamber axially thereof and having elongated radial openings normally in direct communication with the chamber for admitting gas directly thereto, a suction responsive valve controlling the flow of air and gas from the. chamber to the stack, and a member movable with the valve and controlling the effective area of the gas admission openings in accordance with opening and closing of said valve.

2. In a gas carburetor, a substantially annular and fixed mixing chamber having a radial air inlet opening, a stack above the chamber and communicating with said chamber at the top thereof through a fuel mixture outlet open1nga suction responsive valve controlling said opening, a xed as inlet tube extending into the chamber axially thereof and having radial openings normally in direct communication with the chamber, and a member movable with the valve and having a sliding fit with the tube and controlling the effective area of the gas admission openings in accordance with opening and closing of said valve.

3. In a gas carburetor, a mixing chamber having an air inlet opening and a fuel mixture outlet opening, a gas inlet tube having openings for admitting gas to the chamber, a suction responsive fuel mixture valve controlling said opening, fuel supply means including a gas inlet tube having openings for l admitting rgas to the chamber, a memberV direction, said dash pot being separate from the fuel supply means.

4. In a gas carburetor, a mixing chamber having an air inlet opening, a 'stack above the chamber and communicating with the chamber through a fuel mixture outlet opening at the top of the chamber, a gas inlet tube extending into the chamber in the direction of said outlet opening and -provided with slots extending lengthwise of the tube and -opening into the chamber for admitting gas thereto, a suction responsive fuel mixture valve controlling the outlet opening and having a depending stem extending into the tube, a gas metering valve carried by said stein and contacting the circumferential surface ofthe tube adjacent the gas admission slots for controlling the effective area of the slots in accordance with closing and opening of the fuel control valve, and a dash pot including a plunger secured to the valve stem and constituting a counterweight urging the fuel mixture valve in closing direction.

said'opening. said valve having a depending I stem extending into the tube, and a gas metering valve carried by the valve stem and fitting the interior of the slotted portion of the tube,', said metering valve varying the effective area of the slots in accordance with opening and closing of the fuel mixture valve.

6. In a gasy carburetor, a fixed mixing chamber having an air inlet opening and a. fuel mixture outlet. opening, a fixed gasinlet tube projecting upwardly within the mixing chamber and having radially disposed elon-V gated slots extending lengthwise thereof, a suction responsive fuel mixture valve controlling said opening and having a depending stem extending into the tube, and a gas metering valve carried'by the valve stem and fitting within the slotted portion of the tn be, said metering valve controlling the effective "area of the slots in accordance with opening and closing of the fuel mixture valve.

7. In a gas carburetor, a mixing chamber having an' air inlet opening and a fuel mix- Y ture outlet opening, a gas inlet tube extending into the chamber and having radially disposed elongated slots extending lengthwise thereof, a sleeve fitting about the slotted portion of the tube and correspondingly slotted, means for adjusting the sleeve about the tube to vary the effective size of the tube slots,

F a fuel mixture valve controlling said outlet opening and having a depending stem extending into the tube, and a gas metering valve carried by the valve stem and fitting into the slotted portion of the tube, said gas metering valve varyingthe effective area of the tube slots in accordance with opening and closing of the fuel mixture valve.

8. In a carburetor, a substantially annular mixing chamber having a radial air inlet opening and provided in its top with a fuel mixture outlet opening, a gas inlet tube extending into the chamber and having radially disposed slots extending lengthwise thereof, a sleeve fitting about the slotted portion of the tube and correspondingly slotted, means for adjusting the sleeve about the tube to vary the effective size of the tube slots, a bafiie secured to the sleeve in spaced relation thereto and disposed in front of the air inlet opening, a fuel mixture valve controlling said outlet opening and having a depending stem extending into the tube, and a gas metering valve carried by the valve stern and fitting into the slotted portion of the tube, said gas metering valve increasing and decreasing the effective area of the tube slots in accordance with opening and closing of the fuel mixture valve.

9. In a gas carburetor, a mixing chamber having an air inlet opening, a stack above said chamber and communicating therewith through a fuel mixture outlet opening at the top of the chamber, a gas chamber below the mixing chamber, a gas inlet tube opening into the gas chamber and extending upwardly into the mixing chamber, said tube having radially disposed slots extending lengthwise thereof and openin directly into the mixing chamber, a suction responsive valve controlling said outlet opening and having a depending stem extendin into the tube, a gas metering valve carriediy the valve stem and fitting into the slotted portion of the tube,

ysaid metering valve increasing and decreasing the effective area of the gas admission slots in accordance with opening and closing of the fuel mixture valve, and a dash pot below the-gas chamber including a plunger, the valve stein extending into the dash pot and the plunger being secured on the stem and constituting a counterweight urging the fuel mixture valve in closing direction.

, 10. In a gas carburetor, a mixing chamber, a stack above the chamber and communieating therewith through a fuel mixture outlet opening, a gas chamber below the mixing tion responsive fuel mixture valve controlling said outlet opening, said valve having a depending stem extending through the gas tube and slidable through said plug, the plunger being secured to the valve stem and constituting a counterweight urging the fuel mixture valve in closing direction, and a gas` metering valve carried by said valve stem and having a sliding tit within the slotted 1 portion of the tube, said metering valve acting to increase and decrease the effective area of the gas admission slots in accordance with opening and closing of the fuel mixture valve. Y 11. In combination, a stack, a mixing chamber opening into the stack, a suction responsive valve controlling communication between the stack and the chamber, means for supplying air and gas to said'chamber, a throttle valve in the stack, and a liquid fuel carburetor communicating with the stack between the outlet end thereof and the throttle valve.

12. In combination, a stack, a mixing chamber opening into the stack and provided witli an air admission opening, a gas inlet tube extending into the chamber axially thereof and having elongated slots opening into said chamber, means for supplying 3 gas to the tube, a suction responsive valve controlling communication between the chamber and the stack, a gas metering valve carried by the suction responsive valve and having a sliding lit with the" tube and controlling the effective size of the slots thereof, a throttle valve in the stack, and a liquid fuel carburetor communicating with the stack between the outlet end thereof and the throttle valve. 4 13. In a gas carburetor, a stack, a fixed mixing chamber opening into the stack and provided with an air inlet opening, a xed l gasinlet tube extending into the chamber and having slots extending lengthwise thereof, a suction responsive valve controlling communication between the stack and the chamber and provided with a stem extending into the tube, and a gas metering valve carried by the valve stem and littiIg into the slottedportion ofthe tube and controlling the effective area of said slots.

In witness whereof, I hereunto subscribe my name this 18th day of October, 1928.

ENOCH RECTOR. 

